Chen Danxia, Wang Xiang, Liang Jianyu, Zhang Ze, Chen Weiping
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.
Membranes (Basel). 2021 Apr 8;11(4):267. doi: 10.3390/membranes11040267.
Commercial separators (polyolefin separators) for lithium-ion batteries still have defects such as low thermostability and inferior interface compatibility, which result in serious potential safety distress and poor electrochemical performance. Zeolite/Polyacrylonitrile (Z/PAN) composite separators have been fabricated by electrospinning a polyacrylonitrile (PAN) membrane and then dip-coating it with zeolite (ZSM-5). Different from commercial separators, the Z/PAN composite separators exhibit high electrolyte uptake, excellent ionic conductivity, and prominent thermal stability. Specifically, the Z/PAN-1.5 separator exhibits the best performance, with a high electrolyte uptake of 308.1% and an excellent ionic conductivity of 2.158 mS·cm. The Z/PAN-1.5 separator may mechanically shrink less than 10% when held at 180 °C for 30 min, proving good thermal stability. Compared with the pristine PAN separator, the Li/separator/LiFePO cells with the Z/PAN-1.5 composite separator have excellent high-rate discharge capacity (102.2 mAh·g at 7 C) and favorable cycling performance (144.9 mAh·g at 0.5 C after 100 cycles). Obviously, the Z/PAN-1.5 separator holds great promise in furthering the safety and performance of lithium-ion batteries.
用于锂离子电池的商用隔膜（聚烯烃隔膜）仍然存在诸如热稳定性低和界面兼容性差等缺陷，这导致严重的潜在安全隐患和较差的电化学性能。通过静电纺丝聚丙烯腈（PAN）膜，然后用沸石（ZSM-5）进行浸涂，制备了沸石/聚丙烯腈（Z/PAN）复合隔膜。与商用隔膜不同，Z/PAN复合隔膜表现出高电解质吸收率、优异的离子导电性和突出的热稳定性。具体而言，Z/PAN-1.5隔膜表现出最佳性能，电解质吸收率高达308.1%，离子导电性优异，为2.158 mS·cm。Z/PAN-1.5隔膜在180°C下保持30分钟时机械收缩率可能小于10%，证明其具有良好的热稳定性。与原始PAN隔膜相比，采用Z/PAN-1.5复合隔膜的锂/隔膜/LiFePO电池具有优异的高倍率放电容量（在7 C下为102.2 mAh·g）和良好的循环性能（在0.5 C下循环100次后为144.9 mAh·g）。显然，Z/PAN-1.5隔膜在提升锂离子电池的安全性和性能方面具有巨大潜力。
